a.

1. 相等的，相同的[（+to）]
   His reply is equivalent to a refusal.

   他的回答等於是拒絕。

2. 等價的，等值的；等量的；等效的[（+to）]
   A meter is equivalent to 39.37 inches.

   一米相當於三十九點三七英寸。

3. 同意義的
4. 【化】等價的
5. 【數】等面積的，等體積的

n.[C]

1. 相等物；等價物[（+of/to）]
   A dime is the equivalent of two nickels.

   一角硬幣等於兩個五分鎳幣。

2. 同義字[（+of/for）]
   Some English words have no Chinese equivalents.

   有些英文字在中文裡沒有對應的詞。

3. 【化】【物】當量

adj.

1. equal in value, amount, function, meaning, etc.
   ▸ (equivalent to) having the same or a similar effect as.
2. Mathematics  belonging to the same equivalence class.

n.

1. a person or thing that is equivalent to another.
2. (also equivalent weight) Chemistry  the mass of a particular substance that can combine with or displace one gram of hydrogen or eight grams of oxygen, used in expressing combining powers of elements.